Originally Posted by krankieone
If it is a 65 as the heads should have a slot for the push rods (no guide plate required) rather than the round hole they changed to in 66 (requires guide plate) you will most lightly have press in rocker studs which are 3/8 (unless motor is a K code which came with screw in studs) it the engine is going to have a bigish cam and or see a bit of high rpm work I strongly recomend fitting screw in studs
so there must be a difference from 65 to 66, maybe it helps, my heads have the 215 code,, and my engine is not he HIPO "k" code, i wish
but the thing is that i should take the tap off and take a look at the guide that you mention,,
Maybe even a picture of it,
but thanks for your help man!!!!