Dyno pull

Header size is abnormally small, heck again.
Cam size unknown. Huge amount of information missing there, HUGE!
Ported heads. OK, unless you know what it flows , you might as well have stock heads.

What dual plane Edelbrock? There are a few of them. Some not worth more than an OE replacement and others worth there weight.

Rear wheel dyno numbers also reflect how effective or not the converter is, the 727 eats a bit of power and the true size with gear ratio.