new to forum need some advice

i have a 74 duster back halfed car with a dana current setup is a STOCK 400 with a 509 cam eddy rpm intake holly hp 850 a ptc 4500 stahl manuel valve body dana 60 with 410 gears with ladder bars also headers and bullet mufflers and had a plate but never sprayed it

now that the 400 was never gone thru since 72 it finally spun rod bearing (best pass 7.70 at 94mph) in a 1/8 im going to build a reliable fast motor

I'm thinking a muscle motors 525 short block with 440-1 heads b1 intake 690 cam running around 12;1 compression plus maybe a 250 hit of juice.... im looking to keep car somewhat street friendly and want at least a 9.99 in a 1/4 any insight would be great!!!:toothy8: