If you can us the TF, I would suggest that. Others have been able to make other aftermarket aluminum angle plug heads work with manifolds, but don't know anyone doing it specifically with the TF. I would assume they would be the same.

If you don't want to leave any power on the table, You should get serious about piston configuration, compression ratio, cam event timing, and cylinder pressure to maximize power at your elevation. A guy like Dwayne Porter can step you through all of this.