TBI spacer? 89 4.3

Ok, So I need to replace the gasket between my TBI and the engine. It
has a small leak and is sucking air in, which gives a terrible hiss as
well as a high idle.(found this out when I was getting my cat looked
at) I have done some research and the jury still seems to be mixed on
TBI spacers. I figured since I am going to be taking off the TBI
anyways to replace the gasket I might as well throw on a spacer (they
seem to be relatively inexpensive and I like to tinker) if it will
improve performance or mileage. I want opinions from ppl who have
personally tried one, on a Gen 1 4.3 s10 or blazer. Please only ppl
with personal experience. I don't want "in theory it should do this"
or "all those products are scams" unless you have actually tried a
spacer on a 4.3 vin z TBI.  I am not trying to be rude, but I have
found most replies to these type of questions are from ppl who have
not actually tried the product themselves. If you did have a positive
experience please let me know what brand, and if there were any xtra
parts or hints needed in installation
Thank you