ok guys i need help

[chevy68388]

ok im needing help on the price to pay for a truck its like a74 maybe throw78its old whell wells are gone rust all over im wanting it to put a moter in and lift that i have to go run in the mud i will be buying body parts as i go the put a hole new body on it its a 74 throw 78 like i said 3/4ton or a 1/2 ive only look at it throw a fence 4x4 i know his nefu thats how i know its for sale he told me to give him a price i said i didnt know hes had it from new i forgot to ask year but frome what i was told the frame is great and trans is fair but moter is shot so tell me what i should pay im mthinkin 150 or less