To my thinking you would need to know what the stock height outer bolt bosses on the Eddys are; they might be 1.00" like stock Mopar heads.

Then measure your heads to find what was cut, for example .090" and multiply by 1.23 X .090"=.1107". Or, another way 9 [.090 ÷ .010] X .0123"=.1107" off the intake.