Here's what he said on his other thread.........
"Mixture screws seem sluggish
can turn them all the way in runs but not very good. It should stall
out but does run. I had the carb rebuilt a year ago Cant drive it now
live in north East."
The most significant thing with the MP 284/484 cam ,if you really have that one, is the narrow LSA and the tuning required to get it to behave well. As mentioned, it needs gear, converter, more init. mech. advance, 36 degree total, proper cam phasing, proper intake/carb match and on and on.
You haven't even started with the carb tuning. Get the distributor recurved FIRST! Many people blame the carb for a lazy off-idle stumble when they have never touched the distributor.
The tune the carb. You may have to open the secondaries to drop the primaries closed more and get those idle mixture screws to be more sensitive. A HUGELY overlooked necessity that's easy to do but most just suggest a cam swap.
Then play with pump squirter size and pump cams. A 650 is all you really need for that combo too. It would need the above tuning too. Become a carb guy, there's no voodoo once you take the mystery out.
YES, there's better cams. BUT, they need tuning to your unique application too. Why not learn for free on your old cam.
