[MT71c-10]

I agree, mph will be better without the emissions.

350, you will like better, it will cost the same to rebuild the 305 as the 350, and you will use most of the same parts. So you could lightly build the 305 than swap parts to the 350.

You can basically delete all emissions without buying anything, all you need is pcv, brake vacuum, tranny vacuum ( if it's auto ).