best compression ratio street build?

so if i were to build my motor like yours and run a 904 3spd wut should i expect? i cant afford to do the 518 tranny swap for OD and i definatly cant afford a Gearvendor OD ad-on.

if i go with my 904 (and i will), wut kind of gearing should iu be goin with. i just want its to have some good torque to play with at the bottom end and get the best mileage possible. i know with these cars you guys are thinkin "who cares? its a muscle car!" but its my daily driver (my ONLY car) and i need to commute to work and hopefully, college soon.