I have a single thermoquad tunnel ram 400 going together for one of my Darts. Gonna have a 4 speed and Dana 60 behind it. Still looking at head and cam options.
carbs are like women, getting one to do just what you want is hard, getting two to do what you want,..... is much harder but the joy and excitement of it will make you the envy of many... I run twin 650s (tunnel ram) on a SBC and the WOW factor is through the roof... (junk yard motor, stock heads, pistions and rockers) It is a COLD blooded bitch tho, make sure you warm it up at a decent RPM or you can foul plugs fast..
So with a six pack.... http://www.forbbodiesonly.com/moparforum/attachment.php?attachmentid=76595&stc=1&d=1344836745
Your iron heads will be totally adequate for your 383. If you have the closed chamber heads I would use them.
Geebus way to muddy the waters!!!!!!! There is a HUGE difference between a 301 CI engine in a chevelle and a 383 in an A body. That is just for starters. Long runners are for LOW RPM not high rpm. Bigger plenums are for LOW RPM. If you want to spin the piss out of , short runners and a small plenums. A 383, WITH THE CORRECT CAM, will love a TR and TWO 750's. Been doing this stuff for decades. There are three ways to kill a TR. 1) Wrong manifold. See above. 2) Wrong cam. You need a cam sped'd for a TR 3) Small carbs. You need to think this through. I have seen many guys use 450 or 600 cfm Holleys and they are pigs. That's why a single 4 will beat them. Get the correct intake and cam.
Two 750s with no converter and highway gears on a 383? Two 600 CFM carters on a 440 ran fantastic for me with very little adjustment with a purple shaft cam. Use the 2 x 4 top and adapt it to a pair of 4412 2bbls! Better fuel distribution and great throttle response!
Dart Swinger Sedan 2 Dr Hdtp with 330 HP 383 Cu In Engine Shipping Weight: 3194 lbs Wheelbase: 111" 1966 Chevrolet Chevelle Malibu Coupe 2 Dr with 275 HP 327 Cu In Engine Shipping Weight: 3125 lbs Wheelbase: 115" Not much difference
The 4.25 bore and 3.38 stroke give the 383 lots of potential.... Turn down a 440 cranks mains and make it a 426!
I also have the option of a stock '69 375 horse 440. We have one of them in stock too . I could put a tunnel ram on the too, instead of a 383. I haven't decided the best route. What would happen if I put a tunnel ram on a bone stock 440 as mentioned above?
Then use two 650's if you are not comfortable with carbs that big. I never use ANY air valve secondary type carb ever. I did when I was younger. I have learned since then. The biggest issue is the correct cam. And, don't forget, you need carbs that are calibrated for a TR. By someone who knows what emulsion and air bleed correction does.
