The small primaries (390) need only the right PV and MJ, the secondaries are as close as you will get to the right A/F curve.
As the CFM from bigger secondaries goes up (600), the mixture curve deviates more & more away from a small engine wants. You need an adjustable metering block or it will run lean at high rpm. No, a smaller HSAB or bigger MJ is not enough, but it's a start.
Haven't tried it, but a "universal" (JY V8) QuadraJet can be gotten pretty close by using all of the Sprint tuning parts. Great value for low $$. Bad: no manifolds for it, needs an adapter to Holley pattern.
