A 351 crate is a great way to go, lots of options and different setups are available. However, you mention emissions and that is another issue you should address BEFORE you buy. Do your homework and thoughly research the state regs and find out what their requirements are.
Definately check out the used market. A late model SPF is a great way to go and usually available.
And yes, if it is 4am and you are still turning page after page on Club Cobra, you have been bitten!
