Hi folks, I'm replacing the engine on my 1969 chevy 1/2 ton long bed truck. I've already collected all the top end and valve train parts: Vortec heads 64 cc, Comp XE256H-10 cam, roller rockers, headers, performer intake,600 performer carb etc... I was planning on using my existing short block but I would like to drop a complete engine with a rebuilt bottom end. I was thinking of ordering a short block from larrys performance. What do you suggest; 350,383 etc... Cast,hyp,forged ? I apreciate any advice as most of my wrenching has been on harleys and in the shipyard.