yes the 5 litre in your truck is a small block ford engine the best bet is to replace the whole thing with a crate engine like say maybe perhaps a 347 or 331 long block with the heads and everything all ready to go then you just park it next to your engine and swap all the accessories and sensors and plumbing and intakes over to your engine and then install the whole deal back in your truck using your new holley intake manifold and throttle body of course you will want to fix your suspension alot because you said you wanted to and then you will be closer to spending 10 thousand dollars rather then your original 5 thousand dollars but its all good I say go ahead and get the intake yes its a small block Ford the Gt-40p 5.0l with dis ignition and built in auto trans controls to be exact I would also plan to change out the transmission filter and fluid when you put your engine back in the truck just because the timing would be great an oil filter re location is also a good idea on these trucks as the factory water to oil cooler adapter is prone to leaks and the negative battery cable can cause problems so replace that too
your welcome Jamie