[Mike]

Ron, originally, with a 241/248 cam,.57" lift, we pulled 420 FWHP at 6200. (11.8/116 in the 1/4 implies about 290 RWHP, I believe, but the Kluts who built it burned a piston (unbeknownst to me) before delivery...long story).
The 'new' rebuild has all the goodies, 10.3+CR, JE/SRP flat top pistons, Eagle forged crank and H-beam rods, Isky dual springs etc. The recent rebuild was not on a budget, with a target max/limiter set at a conservative 7000.
The A/F ratios etc. are fine (12.9 > 4500/85% MAP). The power curve just starts to fall past about 6200??? Fooling with Desktop Dyno's sim. suggests a big jump with a single plane manifold and a 4 barrel, hence the concern re. the TWM/Weber set up.
I get the idea the ZF-2 tansaxle eats up more than 10%, but tough to pin down. Come summer, a trip to the drag strip might give a clue, in comparison to the previous time slips.
Can't quite make sense of all this.
Mike