[WILMASBOYL78]

I would say as a general rule the #143 cam would be better served with higher compression..at least 10.5 to 1 or better. Many of the original high horse motors ended up with less then the advertised 11 to 1, due to chamber volumes being inconsistent on the heads...so they can live with less. Your new set of heads are about 6cc's less than the factory spec 290's...so that should help. A thinner head gasket may also add a little to the equation.

Another interesting thing to consider are 1971 454/425hp motors...these had lower compression [9 to 1] and used the same camshaft. I believe these had open-chamber cylinder heads....so I guess the combo might work.

I assume you know the exact specs on the current pistons to help with CR calculations??

The engine gurus will likely add more to this discussion. If you can get the engine/cam issues sorted out...a looser convertor [2300-2500 stall] would probably help things...probably wouldn't go any higher without more rear gear or compression.
-wilma