Zip,I yes my cam has the iron gear but I'm still using the bronze gear maybe when the cam gear runs in a little I'll switch to steel.I'm using a gm 509 block splayed caps no fill,front and rear caps are both moving,cam timming for #1 is 1.5 deg ahead of #6 and the distributor needs a +.006 gear.I'm thinking it might spin the bearings but I don't think it will come apart.About T&D rockers I have 1.6 in.ex. like you,there closer to 1.65 You might end up with a little more lift than the math tells you.My in.lobe .450x1.6=.720-.020=.700 I'm getting .708 with racing springs.If you get a chance sometime to check it at the valve let me know. Bill.