Care to speculate my 340?

Put a set of Dougs or tti headers on it, you won't be sorry... I prefer Dougs because they are about 200-300 less than tti for a ceramic coated set. Use the 20-25% off code at autozone.

That 340 with a 275hl will make 340-350hp and 400ish tq with a set of headers on it. The performer 318/360 is a decent intake, an RPM or Air Gap would make a bit more. If the 318/360 intake had the runners cleaned at exits, it's a real close deal. A 1" open spacer under the carb make a lot of difference on all of them.