the temp gauge has 40-100-140. like i say it used to run right at 100 but since i changed the thermostat, now it running in the middle of 40 and 100. im not sure what the heat range of the plugs would be bill, i just bought the ones the book at CT said were for my motor. ive always had good luck with acdelco's so im thinking tomorrow ill go an grab a set and try them out. any recommondations on a better plug for a 305? i triied MJK, Champion, ACdelco, bosch, and copper plus and so far the best seems to be the AC's. i checked and rechecked all my vac lines and hoses while it was running, triied wiggling them to see if there was a crack that i never noticed before but nothing, i replaced most of them when i got the car so they're all in pretty good shape. whats the best way to tell if i have a vac leak? i hooked up my vac gauge and it was in the normal range at about 19 inches. unless its a intake leak, i cant see or hear anything that would lead me to believe that. it also idles really smooth too, just when i give it gas it bogs out until i tromp it a bit. anyone know if i can adjust my rocker arms? or would an 87 305 have roller rockers. im going to try and borrow a compression tester and see what the cylynders are at, the plugs seem to be burning pretty clean tho so i dont think its a head jasket or anything like that...i dunno already 
