Need Help Troubleshooting

What are you using for fuel pump and line?

Seems that by the time your bowls have nearly emptied in 1st gear, your fuel is not being delivered fast enough in 2nd, since RPMs are ramping up slower by gear change.

T in a fuel pressure gauge at the carb. See what pressure you have when it noses over.

What was the previous cam, have you gone bigger or smaller? I would expect a valve train issue to show up at the same RPM regardless of gear. Sounds more like it is running out of fuel, air or possibly spark. Some sort of transmission/converter issue perhaps?

Even with stock lifters, you can hit 6000 easily. Though stock valve springs will be a root cause to limit proper valve timing.

The few things electrical wise that may cause such an issue are, being a seasonal use car, there may be electrical contact issues with fuel pump, or electronic spark controller. I would carefully check all electrical connecfions as for proper crimps and possible pinch areas. As removal of engine components can make for wires being compromised by movement for removal of hardware.

The other electrical issue is resistor or no resistor inline to the coil.
Some coils require a resistor, being not familiar with your setup personally, i am going by what some have pointed out on other threads.

Check your plugs... over all look after each run with quick shutdown and coast. If lack of spark, those plugs should look a wee wet or hqve burnt residue build up.

PHAT69AMX wrote: Ok, just a random guess, ? over pre-loaded hydraulic lifters pumping up and holding valves open ? Agree, 650 DP should work and not cause it, but I did run an 850 DP successfully on a 367 for a while. But would do something to confirm enough fuel delivery to the carb at rpm...