Heavy or lightweight flywheel?

I'm staying with my 30 lb steel one for now... 2.66 1st, 3.91 gears.
My 316 advertised/107 cam ([email protected], .652 lift) needs all the off-idle help it can get, even in a 451. Best stable idle is at 1200 but I can get away with 1100. Retard the timing and it just noses over and dies. So no parades for me ;)