Performance problems with new combo

We're struggling with our car and would like some advice.We went from a 527 bbc 11.1, edelbrock performer rpm heads, .749 lift solid roller and a 8/71 standard bowers blower.We changed it up this year to 572ci,dart pro2 380s and a bds high helix 8/71, 60 tooth bottom pulley and a 43 top pulley.The timing is set at 32 degrees.Our old combo ran 4.50s at 155 in the 1/8.Our new combo only runs 4.60s at 150 mph.We sent out the fuel system to be flowed and the only other change was we went from 4.10s to 3.73s.Were looking for any advice cause we just can't figure it out.The car is a 23t altered with a ati powerglide and converter.

 

put a 456 or 471 gear in it

 

Sorry I forgot to mention were looking to run the 1/4 mile.

 

what size tire

 

33x16-15

 

put a 4.29 in it

 

What does the fuel system look like? Pump size, average nozzle size in ports and blower, and main pill?

what do the plugs look like?

that’s not a lot of blower so even at 40 over you’re probably only making low 20s for boost. If you still have a small cam in it and it’s not super light, then it’s probly a 4.3x combo on kill. If it’s ~15 fat because the fuel system guy overestimated the blower then what you’re running would be about right.