Installing rebuilt engine and don't want to use the old TB on my 350 TPI. I will use stock plenum so what's the best replacement for the money?

 

Stay with the stock 48mm or an aftermarket 52mm at the most. Ebay has some used and rebuilt ones; http://motors.shop.ebay.com/i.html?_...e+body&_sacat= BBK and HOLLEY are into aftermarket. Some people would say to get a 58mm, but that's a pure waste of money. A stock 48mm will out flow any stock intake.

 

Check out the ones that JC Whitney sells. I got one for our 86 Corvette because the old one was sticking. Paid just over $200 for a 52mm and it has worked perfectly.

 

I'd agree that a 52 is as big as you'd want to go on anything remotely close to stock. The plenum opening is already 52mm behind the TB on most of the ones I've looked at. Bigger requires work on the plenum to make them match.

And, I'll just add that the Holley billet TBs were HORRIBLE when we bought one for my brother's 87 GTA project a few years back. Cables/cable brackets didn't want to fit, the stock "swing arm" style TPS they used on the earlier TPIs would scrape and hang on the side of the TB casting (there wasn't any clearance for it- we had to clearance it ourselves) and there was no positive stop to prevent the throttle plates from opening beyond 90*. In short, the stock unit was lightyears ahead in terms of quality, although the Holley looked like a million bucks.