do the vacuum gage hookup on the balance tube that I described and report the needle reading and the needle fluctuations to me. With such high milage there could be a definite loss in power if the engine was not cared for. I have had vehicles with that much milage and they ran well but I serviced it for those miles.
Might be more cost effective to replace the 90 NA with a later model like a 94 or 95 that was in better mechanical shape?