When we did the suspension that I referenced in the TP thread, we discovered that the position of the engine results in the exhaust ports being aimed, from very close, at the pivot shaft for the upper arm. Our answer was to move the pivot mount down and outboard and shorten the 'A' arm. Think of it as a sort of 'Super' GT350 mod. (We used circle-track replacement tubular arms that are easily available in a plethora of sizes. And they're quite inexpensive due to being regularly smashed against a wall in that kind of racing.) If you are going to go to the work and trouble of doing fabrication you might just as well get all the benefits you can while you are at it.
For what it's worth, I copied the article I wrote and posted it in the 332-428 forum some years ago. You might be able to resurrect it if you can get the 'search' to work for you.
KS