Sounds really good at idle, but also sounds like your exhaust doesn't have enough backpressure when you gun the motor.
I'll be running a (basically) stock 318. At this point I'm planning on a VooDoo "401" Advertised Duration 256/ 262, Lift .454/ .475, upgraded valve springs (haven't decided on which ones yet), possibly going from the 1.50 to 1.60 exhaust valves, headers, O.E. Mopar 600cfm Holley, O.D. 4 speed and (for the moment) 3.23 rear.
The OD will allow for something a bit steeper later on. Also, I was originally planning on running a Prestolite which when set up properly are about as good as anything else. But all the talk of "building for MPG" has me second guessing that. Maybe sneak a Petronix in the Prestolite housing, maybe run a Jacobs (ran one on my Bee and loved it). I don't think I'll bother with something like a 6A or 6AL cause they only multi-fire at (relatively) low RPMs and will be of little help on the highway. It will retain the P/S and A/C.
Speaking of my old Bee, I was running a Jacobs on it (don't remember which box but am sure that one isn't available any more) along with their stock looking fast saturation coil, 7mm Taylor wires, Champion J-11Y gapped to .045", 9.9:1, DP4B, OE 625 AVS tweaked, MP electronic distributor, Hemi grind cam (the later .474/280 ) ProStock 1202 headers, 2.5" all out with Walker Super Hemi Turbos, stock converter, B&M shift improver, and 3.91:1
Twisting it about 3400 I was getting 15mpg and it ran a best of
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