Another Carb question for you gurus

Another Carb question for you gurus

Bill,

I have a few more comments/suggestions based on your recent responses to others and their suggestions (see below).

MoparLvr said
I don't race it per say so not a lot of W.O.T. but I'd like to be able to utilize the engine's full potential on demand.(if you know what I mean).

Your desire for "full potential on demand" is why I suggested a 750 with mechanical secondary. This won't be the best carb for mileage. You will need to regulate your "foot" to get good mileage.

MoparLvr said
I've read that 750 holley is too much for a street driven 340 and my low end would suffer and as I said most of my driving will probably be done in the low/medium range rpms. I guess I'm looking for the best of both worlds.

My Demon has 3:55 rear and a close ratio 4-speed with 26" tall tires. With proper jetting, I do not believe a 750 cfm is too "large". But again, your mileage will suffer. By the way my 408 has a 950 cfm Holley and it's a "street" car. But I'm not concerned about mileage or choke.

MoparLvr said
I've got mp orange plug wires 8mm (I think). FBO ignition box (close in specs to the mp chrome box). New Mp distributor. I'm afraid I'm not very well versed in fine tuning but I'm trying to learn.

I also run the FBO ignition box, so that’s more than adequate for your combo. Based on all the above I suggest you send your distributor and your complete set of specs (engine, gears, rear tire size, chassis and car weight) and your type of driving to Don Gould at FBO. Have Don re-curve your distributor and build you a Demon carb. Then you can tap into Don’s knowledge to fine tune your combo. In the long run this will save you money.