OK, i guess the rebuilt engine that was put in my car is a 289 out of a 68. my question is was there any differences between it and the 65 motor? compression ratio, type of heads, anything? i noticed the hp rating was 5 less from factory but thats just for a 2bbl setup. what i was hoping for was to hear i have screw in studs or something like that. anyway, any info would be appreciated!