I can offer a little input on the 3 deuces, although my only experience was with a 406 Ford intake on a 1963 Galaxie 390. It was simply the coolest intake system I ever owned. When dialed in properly they are great for a daily driver because essentially you’re just driving on the center two barrel. Mine took a lot of work to get it set up correctly, but with a 4 speed manual transmission I actually measured 18 mpg two or three times. Unfortunately I almost always found a “need” to use the outboard carbs which resulted in less than 5 mpg. It was like flushing a toilet. If I kept my foot in it long enough I could actually watch the gas gauge drop!
I would love to have 3x2’s again, but it is an expensive upgrade.
And here is a rather lengthy thread on the joys and issues of Thumpr cams. I'd like one of those as well:
http://67-72chevytrucks.com/vboard/s...ght=thumpr+cam