The 3-4 march systems we installed years ago were not the best fitting systems I have ever seen. You needed washers and some access to a bolt store to be able to get everything just right. Every Vintage air unit we have installed fit great and does not have that cheese crap that March puts on there systems. You can always buy yous system uncoated and treat it however you wish. Did you contact VA about your previous issue, I would think they would do whatever they could to help you. That has been my experience.
I have a VA unit on my LS7 also.
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