Cheap 318 build questions

I have a Delta #836-203-2
Lobe sep. 109.3 avg
lift .451 intake .470 exh.
Dur @.050 205.2 intake 208.7 exhaust

Reground from stock 88 318 roller
Advanced 4 deg (timing chain)
idle 20in Hg @800 rpm
VERY strong bottom end pulls to 5500
Performer with 570 Holley Avenger
Ported 302 heads stock valves
22mpg hwy ? city mpg on 87 oct.