Need Advice on Low(er) Budget Race Build

1966 Plymouth Valiant Signet 100. My hopeful car was a 67 Belvedere but I figured for my idea that the lightest possible car would be the best, hence the Val. I've got a gallery of it when I first picked it up and a few on the progress if you click on Gallery List on here. I need to catch up on the photos I'm way ahead of what I got on there right now but if you wanted to take a gander that's what I'm workin with.