I'm seriously considering a Rev-n-nator for my 340 Cuda, but just not sure how much benefit I would get from it. My engine is pretty stock with a mild cam, 9.5:1 pistons, 6 bbl. carbs, factory exhaust manifolds. Seems like the big power increases are coming from engines that are built a bit more and at higher RPM's (above 4,000). The HP and torque curves I've seen match pretty close to MP orange boxes down at the lower RPM range, unless things have changed. The rev. limiter is a very nice feature, though.