For your MPG interest, More details on my 1993 top to bottom:
3/8 intake manifold insulator
Jim Wolf Tech stage 1 camshafts
Stock block 308,000 miles
Gibson 2.5" cat back
Chevy 16" (19lb alloy) with P225/75r15 tires (nearly 100 lbs less rotating mass than most sets of 31's)
Depending on driving conditions we've seen 20+ MPG but 17-19 is more common for our mixed driving which is 75% highway. I hope to keep or improve this when she goes 3.3.
ON the flip side my (MPFI) 89 does worse on MPG. But its lifted, extra wide wheels, typical D/E-rated 31x10.5" tires, heavy bumpers, fender liners are missing (air pockets). It also mostly does short trips with very little highway time and I think the Euro cam with its really long duration is an efficiency hindrance for the lower engine speeds.