Problems after Cylinder head Port & Polish

[Fostang]

I recently mildly ported and polished a set of heads my cousin sent me. I then followed to install them and my car before use to turn on right when I showed it the key. It would never smell rich. At first I tried it with the carburator that was on it but the only way it would start is if I would open the throttle. Then for it not to smell I would need to run it extra lean. The moment that I showed it more air it would start smelling rich but would run great with no hesitations. I installed a bigger CFM carb now it actually starts at the first sign of crank and I can even idle it a little lower than 400 rpm without any hesitations. I maintain it at 575 though. But it still smells rich and my exhaust seems to be emitting a puff puff sound very faintly. I'm confused as to what it can be.

------------------
67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s