Back in my early drag racing days a friend had '70 Nova 396/375 4 speed that he ran in B/Stock. When he got it hooked up, it would pull the front wheels. So a Big block is definitely one way to go. Since he was limited by rules to a 7" tire with tread, he really had to work the suspension. Of course drag tires have come a long way in 30 years from those cheater slicks we used to run. Since that motor was really underated about 40-50 hp, and he had it blueprinted with a cheater cam (Lift and duration match specs, but lobe profiles way different), and 2" headers, I'm sure his true horse power was above 450. He also was running 4.88 or 5.13 gears and had all the suspension tricks allowed by the rules. That is 90/10 shocks up front, 6 cylinder springs (you already have those), Lakewood J Bolt traction bars, battery in the trunk and subrframe connectors. His car ran high 11s and while the car was street legal, it wasn't really very streetable except for the occasional Saturday night jaunt with glass packs bolted on the headers.

Bottom line is, you could get your car to run like that, but it will cost you some $$$ and the challenge will be getting it to hook up. I would suggest a strong 454+ big block with a 4 speed automatic with a good low first gear and overdrive, then get a good street strip torque converter and run 4.10 gears. With the right wheels, you should be able to get a 9" tire inside the stock wheelwells. With the street strip tires available today you should be able to get it to hook well enough to pull the front tires, especially if you are on concrete instead of asphalt. But then you will start breakin' stuff.... But that's all part of the fun!

Good luck with it

Pat