I'm sure you've thought about this, but why not put a 318/360 into it rather than a Chevrolet? When you go to sell it, a true mopar person won't give it another look if you put a Chevy in it. Just my opinion. I have a '48 Club Coupe and am in the process of putting a 360 into it. You can get a kit so that everything works with your stock frame. No fabrication or cutting. You will have to weld the mounts in, and drill holes for the cross member but in the long run it's a pretty simple deal. Just a suggestion, and good luck.