Ford Repair: Engines, 1965 ford f100, jasper engines

Question
QUESTION: I'm buying my first truck off a family friend for $500. Its a 1965 Ford F100, and I'm pretty sure it needs a new engine, what kind do I need? Does it matter what the model is?

ANSWER: always order your engine by year make and model-if you are going to keep truck be prepared to spend money on it-is it a 6 or 8 cylinder that matters.

---------- FOLLOW-UP ----------

QUESTION: Thanks. how much would that cost?

Answer
still didn't answer question-6 or 8 and which one that truck possibly could have 6 different engines depending on configuration-being a f100 probably had a 250 6cyl or small v-8 cost is another thing that depends on used or rebuilt and if rebuilt quality of engine jasper engines would be one of the top of the line engines a little more expensive but in 20 years we have had good service out of them-a problem every now and then but jasper has always taken care of them.
used is always a gamble
cost also depends what area you live in-we are in northeast georgia so it is less than 80 miles south of us which is in atlanta area our labor rate is 62 per hour-its about 80 per hour or more down there.
there is a lot of variables but first you better know which engine you have and an automatic or manual transmission.