Figured I would share this experience with you all in the hopes we can learn something. I installed an Innovative wideband sensor last night to make tuning the Holley 750DP much easier. Cool part is that the gauge fits in the ashtray so I can easily hide it when it's not in use. Checked my manifold vacuum at idle and it's around 5". Since the stock power valve opens at 6.5 that would explain the overly rich condition the car has. I swapped it out to a 2.5 PV. I managed to get the idle to 13.7 on the wideband. Any leaner and the car would stall. Took it for a cruise afterwards and getting mid 12s at 60mph. Running pretty rich on the stock 71 primary jets. I think the 2.5 PV is slightly too low because when I accelerate lightly on the freeway the wideband hits about 16 before the PV opens to richin things back up. Gonna try 69 primary jets and a 3.5 PV next
Here are my engine specs:
• 360 bored and stroked to 408ci
• 10.3 to 1 compression
• Eagle forged stroker crank with ESP armor
• Eagle forged H beam rods
• Keith Black forged pistons
• RHS 2.02/1.60 cylinder heads
• Hughes 1.6 roller rockers
• Comp Cams 306S camshaft
• Edelbrock Victor Jr intake
• Holley 750DP carb
• MSD ignition
• Dougs ceramic headers
• 3” dual exhaust with X pipe