[Kracka]

The 88-89 SQ did get a slightly larger intercooler.

Your spool-up time will at most only be a few hundred RPM later than it was before once you get your leaks fixed. There is a gasket on the turbo outlet (assuming 14B/16G on a 1G) that likes to leak, they are pretty cheap to replace. Other than that, check all couplers and clamps and make sure your IC necks aren't coroded at all. There are also gaskets that may be suspect on either side of your throttle body.