2 directions I could go right now, I have a standard bore 383 short block that is in good shape that I will likely rebuild this winter. Nothing to special, just looking for a nicely balanced rotating assembly and I'm not even going to bore it if I don't have to. Looking for a comp. ratio of 10.5 to 1 or so.. I would like to use aluminum heads and I am thinking Edelbrocks, not sure on the cam yet , just something that will work well with that intake and carbs. Roller tip rockers. I'm not looking to go racing with it, I live in the Detroit area and there is always some serious cruising going on on Woodward Ave. and that is what I am all about. Almost forgot, the Road Runner is a 4 spd. car. The second option is not for sure yet, but I know of a complete `69 Road Runner drivetrain including radiator and K-member that is all fresh and ready to install. If I went that way, I would just swap out the intake and carbs and run the six barrel. I should know more about that oportunity soon.
Looks like you have a nice set-up there, shop and all, Moparal.