See the three weird looking "tabs" around the inner circle just outside your lugnuts? They are shaped so the "dog dish" pops over them. They're pretty snug. usually need a pry bar (screw driver) to pop them back off.
The clearance is built into the horn ring! Springs hold the connection "open" and when you push on the center cap, you collapse the springs, thus closing the connection and the horn(s) sounds.
Ace Hardware! Ace is the place! Plus they're actually helpful! 9 times out of 10, I'm heading to the screw/bolt/fitting aisle for something car related.
Gotta love cheap horsepower! And the little kicked around 318 certainly responds to modifications! Built right, they're hard to tell from a 340! Especially below 5500 rpm!
There are several companies that make aluminum radiators that look like factory. Aluminum is better at transferring heat than brass, but needs to be isolated by rubber (think thin rubber washers) to not crack for flexing.
OK, what exactly are you looking for? The "Dog Dish" caps? There were two different sizes - 9" and 10" so you need to measure your wheels and see which size they are made for. Guessing yours look to be 9" but measure them for sure!!
In that case, you may be customizing your own top bar. Does the single barrel intake on your Hemi has the same holes to mount the bracket (lower right corner in the second page/photo I sent)? You may just need that Hemi bracket and the adjustment in the 440 top linkage rod might work fine.
If he got new replacements, they don't punch out the hole on the driver's front panel for the adjustable mirror. See measurements below. Hopefully my crude measurements help.
Install them dry. The oil will soak into the cork gasket. After about 30 years the cork might get hard and crack and maybe cause a leak. So in 25 years when doing that oil change, put in new gaskets. 😁
See attached photos from the MCC Restoration and Judging Guide for E-Bodies. looks like just out to the Hemi top rod and the bracket that bolts to the Hemi intake will do the trick. After all the 440 and 426 are the same distance between the top of the block and transmission. And the vertical...
Welcome to FEBO from the desert. VIN on top of page is BS27H0B371911. Had leather/vinyl seats and a black and white interior. White seats, headliner, visors and door panels. Dash, carpet, seat belts and steering column were black.
Your power steering pump pulley looks different than the one on my 70 Challenger 383. See photos below. Your pulley spokes are "wavy" compared to mine.
Assuming they're in decent enough shape where a fresh valve job will revive them (no cracks or broken pieces), the 302 heads are great to run on any small block (273, 318, 340 & 360).
302 heads are always a good option. If you run a bottoming tap into each head bolt thread in the bolt and blow the holes out with compressed air (should always do this with all blind screw threads), the longer bolts will work fine assuming they came with washers.