You should come out better since you say you are good at mechanics!!!!
This isn't changing your oil, replacing an alternator kind of mechanics. Really you are designing the powertrain of a vehicle by yourself. You have to position the engine and trans, set up the cooling system, throttle system, shifter, driveshaft, rear end... Nothing is cut and dry. I ran into instances on mine where others say this fits great and it plain wouldn't work and vice versa... no two swaps are the same.
A good running engine is key when you are on a budget. I paid $200 for mine and got lucky, I have another one I paid $150 for that "runs really good" that needs $1500 worth of work to have a runable long block.
I got a new carb because I didn't want to deal with somebody elses problem ($400 Edelbrock 500) a new intake because I couldn't find a used one when I needed it ($170 Wieand Stealth) and a new radiator ($170) because my used one was leaking and I didn't want to keep making hour and half trips dragging home leakers. Add to that the $200 C5 trans and a custom $200 rear driveshaft and a $325 dual exhaust system (+$160 headers)... don't forget to add something else to cover all the extra crap (efan, hoses, gaskets, silicone).
Aside from the carb, intake (which isn't much more than a used one) and radiator... unless I made my own driveshaft and bent my own exhaust I don't think I could have gone much lower unless somehow I got the stuff for free. It adds up really quick.