I have seen ALOT of people spray 200 shots on stock engines. The biggest thing is getting towards the 500ish limit of the block. I know somebody spraying a 200 shot on a stock block 331 that already made upper 300's n/a. Dunno how long that is gonna last!
I would have to say only the dedicated track guys are running 200 shots on a somewhat stock block. With a 200 shot I would only hit it a couple times a month at the track.
I'll let yeah know in a few months , my coupe has survived a 200 shot over two stages screwing around on the street as side from a head gasket here or there. Handles a 100 -150 a few times a week no problem. My project car ( Light weight 90 GT, stock 150k bottem end ) will be getting as much as it takes for the crank to meet the ground. I figure a single stage 250 shot from my NX efi race kit will do it i, within a few passes.