[fastd]

Follow up: Guys, thanks again for your comments. I was wondering if I could ask for your collective opinions yet again...

I finally have some dyno numbers: best run was 314 hp at 6150 rpm and 296 torque at 4900;average run was about 301 hp at 6000 and 290 hp at 4000 rpm.

Shop recommended I switch to a 4150 Holley Double Pumper 650 cfm (currently running a 4160 Holley Single Pump 750 cfm) because they are having trouble balancing air/fuel at the high and low ends and the secondaries don't seem to be kicking in quite right; seems too lean above 4000 rpm; tried bigger jets (started at 72, moved to 74, then 76) but not getting better, air/fuel still over 14 at higher rpms. Replaced power value and that didn't seem to help too much (old one was functional but "weak").
Separately, also recommending replacing undercar exhaust and muffler with 3" exhaust with muffler that exits in front of rear wheels.
How does their advice sound to you all?
Regards.