in my opinion, the 6-pak is more versatile than a large 4bbl; which you will need to feed a big engine. the small center carb drives nice, good throttle response. i also like the vacuum carbs for street use. tuning can be a little bit of an issue, but i blame most of that on bad advice. the only real issues i've dealt with on 6-paks was richening the idle circuts on all three carbs and richening the main metering on the center carb. also check for manifold fitment. edelbrock hasn't figured out how to machine them correctly. maybe in another 40 years they'll get it figured out.