the 69 iron pump is shallower so you'll need a spacer to move the fan forward (no big deal) to where it was with the alum pump. Check bolt length & use spacers/shorter bolts as needed to duplicate what you originally had (good precaution/use Permatex #2). the rad hose/nipple and timing marks will be (both) on the DR side but you can see the marks if you aim the light just right (or find exact TDC & make a pointer for the pass side. Some paint marks on the DR side tab for 0-10-15-17-20 helps with this & some paint marks on the dampener if you use a pointer on the pass side. 0.0632683" around the dampener circumference is (1) degree (cut/measure a strip of white paper)