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Old 02-20-2014, 11:16 PM
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I think you have the EGR version. Here's what Edelbrock says:
PERFORMER 351W EGR (idle-5500 rpm)
Designed for street Ford 351-Windsors with EGR. #3781 is stock replacement/street legal part for 351-W 2V V8s; 1972-87 and works with either the OEM 2V carb or an aftermarket EGR 4V carb for off-road by using Edelbrock #8053 4V EGR plate and compatible EGR valve and gasket.
And it looks like this, with the same hole yours has:

Click the image to open in full size.

So you need the #8053 4V EGR plate. Or, some way to positively cover that hole.
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Rusty: '81 F150 Ranger XLT 4x4 w/a 351M, RV cam, Performer carb & intake, C6, & 3.50's
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads, Weiand intake, Street Demon 750/ZF5/3.50 gears w/Kevlar clutches
1969 Super Bee awaiting restoration
1950 Chevy 3100 in queue
Worst fear: I die and my wife sells my rides for what I've told her I have in them.
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