Ok, I'd mimic a 340 then. Use 360 heads and any 340/360 intake manifold including stock 340. Next you need a cam in the 210-220 duration @ .050 and .450"-.490" lift range. Sell what you don't need. Have your block checked to see how much it will need to bored to just clean up the cylinders. Find a shop that can bore and hone with small block MOPAR torque plates. Look at pistons that will give you 9.0-9.5 compression ratio with 73 cc chambers and .039" thick head gaskets. I'll check to see if I have some 1.88 intake valves. Get some 1.60 stainless steel exhaust valves. For springs use TFS 16942-16, 115# on the seat at 1.700", 285# at 1.200". I prefer custom cams, or an Isky cam. Get one made for your car and driving preferences. Not a fan of cheap cams anymore, too many problems.