Originally Posted by Oldwolf
Thank you for your answer. I´m not jokying. You have to excuse me for my spelling. The engine was built in the early eightees and was built for dragracing in Sweden. It´s been parked since then. I have´nt decided yet if I should change the engine to a more useful setup, change cam and induction, but that involves a lot of work with the other parts that are setup for competition, gearing 5.14;1, ladder bars,big wheels etc. I will not compete with the car (not competitive). I havént checked vacuum reading, but i suppose its low. I started the engine last week, it run good but the idle was rough and hi. The carbs are stock from the boxes, chokes and all. I will will try once more after checking vacuumreading and after I get some information about dual carb tuning. Otherwise I just have to live with it as it is. I will atleast try before I give up. I send you a photo of the engine so that you believe me.
Something that may be an easy solution would be to get a single 4-barrel top and use only one of the carbs for "regular cruising" and put the duals on when you feel a need or want to go to a show.
I never suggested that I don't believe you or the engine build...nor do I think that I implied that in any way. The language barrier may be a contributing factor, if that is what you thought I meant.
The combination is certainly "exciting," though rather impractical for your apparent intended uses. A set of flat tops and a 393 stroker would do a world of good for it in terms of mellowing it out without really reducing the power levels.
You may want to try restricting the carburetion. One choice is to purchase a pair of plastic 4-hole spacers and then cut out a set of ~15mm holes centered on each of the 4 holes from a piece of sheet metal. Make a pair of these "restrictors" and simply remove them when you're looking for more top end.
Another choice might be to purchase a couple of very small 4-barrel carbs with vacuum secondaries and use them most of the time, switching to the dual mechanical 4s whenever the mood strikes you.
Something else that you can try is to simply remove one air filter element from each carb. Keep the smallest volume options. Not as good as restricting from below the base of the carb, but it may be a very simple way to try to increase your vacuum signal.
Another option for restriction may be to build a restrictor that fits between the top and the bottom of the manifold.