the 396 402 are good engines but there are some things to look out for. make sure it is not filled the water jacks .some guys do this when boring the hell out of them .some of the old 396 can be bored out to 4.250 but do not bank on it .so you need to know were the bore is and theCR .pistons size are some times as much or more then 454 pistons on old block the cam needs to be cut for oil rear journal of the cam or the cam bearing get this wrong you have low oil psi 65 to 67 blocks i think were like this .never had one this old but watch out for the cam. and by the way i have 402 that will be all done .all new but the block aheads casting new steel crank and new forged piston small hyd roller cam sorry for the plug i need to sell this