take your air cleaner cover off and open the butterfly blades on your throttle body and snap some pics down inside you might get a good shot of it to get somewhat an idea

 

Looks good
Mirror & a flash light or trouble light can make it easier to see down the tb
If your wondering pic below was when I was running 52tb & M1/2BBL (w/turtle) (55/4bbl now)

 

perfect!!!

 

I will do that 2moorow!

 

Looks great man, deff a good price. Theres something people dont understand about full size trucks, they'er not like small suv's and pickups. Usually fullsize trucks are so expensive from the dealer because they'er built to last, and if you know your way around an engine you can make them last forever.

 

I have the window sticker and this truck was 31,600k new! Seems like a ton for 1998. It has all the HD options and towing package, so I couldn't be happier. I figure worse case, find a new motor and tranny at a junk yard and drop it in. I know alot of engine basics, like pulling them out, dropping tranny's etc;, but this is my first dodge and I don't know anything about the codes or how they act compared to other trucks I've had. I am excited about this truck and look forward to years of enjoyment with it!