Can anyone give me advice on how to align my twin Bravo 1 stern drives? Also, Should they be parallel, toe in, or toe out?

Parallel. However, I have read where others do a little in or out depending on rotation of the props. There theory for toe in or out is that under way the rotational torque cause the drives to move in slightly to parallel. Mine are perfectly prallel tied with latham external steering and my boat tracks perfect at idle or above.

It really depends on the boat. you should try different setups. Try 1/8" out them move in a small fraction at a time and see whats best. some may be faster but not handle as well. you will need to come up with the best for your boat.

Thanks for the info. What is the best way to determine parallel?

measure from the centerline of the leading edge and the centerline of the prop shaft . Both measurements being the same will be parallel .

Thank you.

I was told , 1/4" inch toe in ,my props turn out 28ft pantera twin 496 ho with Bravo drives ?