......Could anyone give me an idea of what a cam out of a 1990 305 TBI Truck could be? It is in my car now along with the truck heads.....thay came on the 305/ I bought this engine with 8 miles on it from the factory....don't know what truck it was from but was told a blazer but 305 did not come in the blazer in 90.........maybe it is not a 90......it has the serpintine(spelling) belt system tho.

 

Its a weak cam in the range @.50 (190's-205's) but great for tourqe along with the swirl port heads.
Since you put the heads and cam in your car you probably know a little more than us. It was possible to get a roller cam in a 305 or 350 truck but not common, I've only seen one.
SSC