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I am doing what may be called a somewhat unusual swap. LS-1 into an MGB with a twist (body shell widened 2 1/2", tons of metalwork with subtle changes to just about every structural piece in the front, BMW IRS, etc...). Space is at a premium and headers will be a tight squeeze, and I want to push the mounts forward a bit to gain room for the headers. Has anyone built mounts using the front motor mount holes and then picked up the holes for the air con compressor on the right side and the alternator mounting points on the left before? I will have to move the alternator to the upper right side anyway and no air, so those mounting point won't be used for anything else and looks like the way to go to get the space I need.
Here's a very early pic of the first test fit from before any metalwork began
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Engine mount question 
