Granted, you now have more issues than just ticking lifters but take note. I have a 90 and brother has a 92 300-E 2.6. They have knocked since day one until full oil pressure is up. Both cars lived on synthetic (mostly Amsoil). Both received care way beyond the norm. The 92 was brought in for new lifters at 87,000 miles. The old lifters when pulled showed no wear, the mill marks were not even polished down. The brand new lifters remaind silent for 2 days and then the ticking came back. Seems to be the nature of the beast with this engine. I don't think these engines like the new thin oils such as the 0-30's, 5-30's or even the 10-30's. My 90 does much better on Amsoil synthetic 20-50 race in the summer and 15-40 in winter. These engines were machined lose back in their days. My 98 Chevy is machined tighter and must run on the thin oil. Oh, getting back to the lifter change out that did nothing, every lifter was changed. You would be nuts to not to do them all.