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What engine do you have? 5.0 ?
I have the 351W and the drivers side head (not the valve cover) clears the firewall by less than 1/4 inch. I was anticipating issues but so far it has not been.
Also had issues with headers. I have long tubes and the driver side rubbed the frame rail but when hot I went down with a pry bar and levered it a bit but only gained a small amount of clearance. After logging about 500 miles I went down to look and it now has more than 1/2" clearance probably due to pressure being applied when tubes were hot while driving.
351w to firewall clearance:
your engine looks to sit lower and further back then mine
Not much, I have the inner finder cut away from the header on the passenger side. I have the inner finder cut but not put back together yet for the shock clearance on the drivers side. I think I'm going to modify the valve cover for clearance, just haven't got to it yet. Been looking at the Hydroboost I have I think I'm going to modify the mounting of it as well. I have a list of things I need to order, not much for Black Friday savings but maybe a little.