I know this will tweak Streets BUT, you may be able to squeeeeeeze in a 289 ford with some major mods to the inner fenders and firewall Ive seen that done with the nescessary frame strengthening ,it does work .....How about a turboed
RX7??? takes up less space than the original power plant and
no major frame mods are required apart from some ladder bars.
stops the frame twist under hard acceleration Built one back in 79
with 12" rears it was hard not to spin the rear end at each gear change (4 speed manual )scared the s...t out of me and on a wet road was downright suicidal...sold it soon after completion
my wife then woudnt get in the thing