67 steel crank is what i can get. From what i read it has the smaller register. an auto has to be drilled or turn down the converter. I was wondering if it was the same on 4 speed?? I'm not sure on piston choice there is not really much available for the 340 the block is already 4.070. the cyl walls look bad but measure ok.. I think it will clean up to 4.080 if not 4.100 may be what i have to work with. but i wont know until i have them sonic the block and mag it. My plan was running my x heads but they have large combustion chambers. i need to check them when i get them back from machine shop i'm thinking they were about 74cc. I really didn't even plan on rebuilding it it actually ran ok slow but ok. it smoked a little on start up intake leaked & valve covers leaked it had an old purple cam in it. I planed on reseal upper end and swap in smaller xe268h cam. when i pulled valve springs i noticed couple very loose guides so I pulled the heads sent them to machine shop. oil pan looked kinda dirty so i pulled the short block to clean it throw new set of bearings in and put new gaskets in it that snow balled into the bearings are bad crank needs turned but its already .020. Now im rebuilding the whole thing.... actually thinking now if i got to but crank rods and pistons buy a stroker kit... But how well will a 422 run on factory head or exhaust manifolds.......