1972 Dodge Colt

That O2 is basically reading (1)cyl. + whatever reversion puts into that part of the merge, the lack of collector extensions are hurting Your launch at that low an RPM, I know it's a tricky dance in there..
Yes I agree.
I don't want to hurt the top end.
It's going to be difficult to change the collectors, but more torque down low will help.