Third Generation F-Body Message Boards - Shaved heads and the distributor?

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Shaved heads and the distributor?

I am about to buy some heads for my 305 and they are shaved down .020 and I needed to know if I have to use shims on the distributor?

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One Tight Teal green 91 RS (my first car:)
All Rustangs suck!!!!
5.0 TBI with Auto trans
Z-28 wheels
K&n with dual snorkel intake
Tx Smog Pump Delete option
Valve cover breather
Rapid Fire plugs with Accel ignition wires,coil,cap and rotor
Flowtech headers with flowmaster and Half way cutout
B&M shift kit with trans cooler and hurst hotshift fulid
Hypertech thermomaster chip
96 LT1 cam with
New liffters and timing chain
All the free TBI mods

You'd have to shave the intake or the intake face on the heads to have the distributor be off. Only thing you will have from them is a misaligned port at the intake by .020 (maybe) but thats too little to worry about.

Why are they shaved .020? Thats quite a bit for just cleaning them up.