Edelbrock lists two different part #'s for their High-Flo base. #3860 Machined to clear center bolt valve cover heads and #3861 for aftermarket & early model heads. I plan on using the AFR 190 cc centerbolt heads. I realize this question sounds to easy, but when I called Edelbrock Tech support, the guy I talked to did not know. He had to ask someone else who told him either one works. those of you who have this combination which part # is correct. Thanks for the help.

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1990 RS Camaro 305 TBI, 700R4 Tranny, 3" cat back system with flowmaster muffler, Edelbrock strut tower brace, rear panhard bar, and torque arm, Spohn subframe conectors and lower control arms, all polyurithene bushing under the car, KYB gas adjust shocks and struts, March underdrive pully system, Taylor 8mm plug wires, Accel super coil, K&N air filter, Hypertech chip, GM Aluminum driveshaft, 3.42 Zexel-Torsen Rear end with superior 28 spline alloy axles, and Summit aluminum rear end girdle, Killer sound system, Many new mods to come (swap to 350 comming soon)

 

If you're buying centerbolt heads, buy a base for centerbolt heads. If Edelbrock is like Accel, their bases will work with both styles. The only real difference is the bolt angles in the middle 2 bolts.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

I ran the 3860 with the afr 190 heads with no problems.