Running a similar combo in my 71 runner. .030 over with flat tops .010 down in the bore. 484 cam on 108 Eddy RPM heads 84 cc, .038 gaskets with a 4.380 bore. Eddy RPM intake, 1-3/4 Doug's headers. Street Demon 625 mixer. Set the initial at 18 and the top should be 38, mines at 40 for the moment. Too cold to play outside right now. tko 500 5 speed and 4.10s with 27 " diameter tires. Put the RPM on and get it aligned. For that duration cam 14-16 initial should be close, and dump the Holley and spend the 325 for the street demon. They mix better than any Holley or Edelbrock at the low end. I know, I tried all of them and for a driver, there is no touching that T Quad style triple booster small bore primarys for response and mileage. The 625 has made 650 hp on LS engines so it's plenty. A 750 SD will give you a slight hesitation on the secondary, been there. When I do the next build, I will bump the compression with a 0 deck and surface finish for .027 Cometic gaskets. If yours was done maybe check and see if the surface finish is smooth enough to use them. Anyway, very happy with it even being slightly soft on the bottom. It winds up so fast that you don't notice it, and will pull through 6500 in a flash. Idle vac is about 10-12 once it's warmed up gets 16 on the highway but Max cruise vacuum is somewhere above 100 mph,( still working on finding enough cop free highway to determine that). Very livable but the carb makes all the difference.
