440 power gains/ aluminum head advantages?

THAT imo is your problem, probably still have stock 5/16” line too. 3/8” aluminum line minimum with electric pump. The Red Holly street pump will work fine in 1/8 mile, a blue in 1/4. That 850 DP is running out of fuel! Also unless your tank is full the gas is moving away from the stock pickup
wouldn't i feel it completely fall on its face thought if it was running dry in the bowls? it revs all the way to 6k no problem, just super underpowered. are the holley pumps mech or will i need to wire in a electric. i wanted to upgrade the fuel system at some point because i planned on throwing a 100 shot on the motor once i got everything running 100%