Engine question

Welcome to FABO! If you're converting from a 6 to an 8, you're in for quite a project but if you get the right parts, it'll all just bolt in. A donor car would be the best way otherwise you'll be on a treasure hunt for a lot of it. There are many threads on here that have covered the same subject so do a search in the various forums and you'll get a lot of opinions and advice. The first thing to decide is what you want to have in the end.....a cruiser? race car? show car?......and build accordingly. Have fun!