Main problem with slant 6 is head flow, fully ported they only flow as much as a stock 273/318 port. A fully built $$$$$ NA /6 at best will cracked 300 hp most are probably in the 150-250 hp range.
Agreed. But for a good cruiser, the /6 will do me just fine. I like it's durability, reliability, and generally low maintenance and fuel costs compared to the V8's. I'd also rather have the /6 over the V8 because I like being different. IMO, although the V8's are OK and have their place, they have been overdone at shows and such. Dare I say it... boring.
If I want a hotrod, a turbo'd /6 like Shaker 223's or Mr. Dedman's would fit the bill quite nicely, I think.