4 psi is low side , should be 5-7 psi .
I would first take the top off the carb & make sure the float level is set correctly , none are from the factory ,
The spring on the secondary door could be set too light & opening too soon causing power loss with too much air &*no added fuel
As I have said many times I wouldn't put a Comp Cam in my lawnmower, their stuff is Junk .
The problem started with the cam swap so it has to be related to that .
27 degrees off yikes ,I hope the valves didn't touch the pistons
I need to be clearer , I said many upgrades are just $$ spent without gain .
Redesigning the suspension with different design such as rack & pinion steering , coil over shocks instead of T bars , 4 link rear suspension using coil over shocks , Air ride , etc do not help the car with traction or...
Tubular upper control arms will help wheel alignment for sure , tubular sway bars increase roll stiffness & decrease weight , much fatter torsion bars & high quality shocks will help a lot , you can use composit rear leafs & better shocks on the rear , better 4 or 6 piston brakes with hydroboost...
400 stroked to 451 is one of the strongest / most reliable builds possible .
If you are OK with computers & tech the Hellcat is a great option , reliable & efficient
Be careful with suspension "upgrades" the Factory suspension was well ahead of its time & works very well when updated with...
Welcome Saul
The unique 70 parts are a long list , it would take a while to list all of them & i would still forget a bunch , what parts do you need & we can help with the differences .