Is this a good candidate for magnum head conversion?

Steve, if you aren't planning any crazy updates and intend to run it the way it is after you get the cam etc, I would call PTC and tell them exactly what you have. They will want to know everything, car weight, engine combo, gearing, usage etc. Then let them build you a converter to work exactly the way you want it too.

It will cost a tad more initially, but you shouldn't have to drop the trans and put another one in when you are disappointed with the first one.

Just my 2 cents.

PS. I would run a small external cooler. I do on my car and haven't even put the new converter in.