Welcome to the site. Looks like a fun project. While almost all of us will be willing to offer opinions, remember to do what you want. Make it a car you will enjoy (even if your building it to sell it off). In my humble opinion, unless you are trying for a restored show car, get bad with it. A 428 would be nasty. I love the old cruise-o-matic trannies, (hence the user name) but if you are going more power, get a tranny that will play better with teh horse power. Again JMHO and welcome.