Need a little horsepressure.

As Boxcar said you need to know exactly what you have before you go changing anything. There's a fair chance that after 33 years It'll be a bit like "Granpas Axe",
On the LHS of the Engine under the rear head will be stamped to ESN.

Go Here Cummins QuickServe Online Create an account (It's Free) register your ESN & you have access to all sorts of Data & Parts Books ECT..
As has been mentioned the details on the Tag on the Fuel Pump will help Too.

 

Looks like Ford blue. Cummins and Cat painted their engines blue for Ford. I see more of the red painted ones they sold to International laying around tho.

 

Did you ever see a puke kind of lime green one? I saw a small cam hid in the corner at a tank wash years ago. What would that have came in?

 

It was Euclid green. They were in Whites and White-Western Stars back in late 60’s early to mid 70’s back when White Motor Co. owned Euclid.
My ‘72 White 4000’s Nh250 still had remnants of that color on it when I got it in 2011.

 

If you’ve never seen a KTA or a 6-71 in a Western Star now you have. Lol