Im new to the world of jets but, I have a 78 cvx 20 with a 12je-a pump and a 460 ford engine. I have completely rebuilt the engine with all new parts.
the only thing that was reused was the stock d3ve heads the have been gasket matched and heavily ported on the exhaust side. The lower end has
been bored 30 with flat tops and arp main studs and rod bolts.  Im running 10.5 to 1 compression with a comp extreme marine 288h hydraulic cam
288 duration on intake with 580 lift and 304 duration with 585 lift on exhaust.  The intake is an offy port o sonic with a spacer.  The carb is a AED holley
850 mech secondaries with electric fuel pump. I have comp roller rockers installed on the heads with the egr ports completely cast closed and port
blended.  The 12je pump is stock with an a impeller and I have installed a SS loader, the pump does not have a place diverter installed.
dizzy is a USA accel mech. advance with msd blaster 2 coil. no box.
Lake/gps test read 58mph at 3900rpm!  that just seems a little low, both tach and mph.
Any info. ?