I got a 383 last week that the short block turned out to be a dude, but on top of the engine was a super nice re-done set of 462 camel hump heads that have screw in studs, guide plates and really nice springs. Might check the springs to see if they are better then the ones on my 062 Vortecs to use. Are these worth any money these days? last set I bought I only paid like $25. LOL and that was in the early 90's. My car ran 12.50's with them but I have no use for them and I don't think it's worth porting them.