well why not just getting a 350 4 bolt main and putting the 305 crank in it, its still a 305 just with some more to hold that crank in it will turn a lot more rpms then that 2 bold 305 block. if you do that then why not just get the rpm performer package i don't know if i would use a 600 cfm i would go with around 500 that will give you more then you need. if you want to get real different the put 2 4 barrals on it every one will think its at least a 350. thats what i would do. so maybe i helped you out. let us know what you do and how it turns out.

Cd