zoom flywheel questions

I've been running that flywheel on my 318 now for about 8 months with no problems so far. My engine is a '68 model but it should work on a '74 just fine. Post '92 is a magnum which is externally balanced from what I understand and the LA 318's are internally balanced. What kind of power is your engine making? It's a stock replacement so if you're planning on big power you probably want to invest in a different flywheel that's rated for that.