power to cab, but nothing when i turn the key to start the truck

[oldblue1968chevy]

okay, i have power to the stuff in the cab, heater blows, turn signals headlites all work....but when i go to start it with a battery hooked up, AND jumper cables hooked to a nother truck.....nothing happens....

NOW, nothing on the alterator is hooked up, no wires going anywhere, just the belt is hooked up.


if i wire the alt. up will the engine start up like it should? or is something completely wrong..

reason im doing all of this is ive been looking at buying a swb truck with cracked block...was pricing motors today after schoool...and thought to myself,,,HEY why dont i see if i cant get my 350 in my parts truck to run...so i slapped my old quadrajet on....wired everything back together, scooted all the junk over so i can set down on the seat, turned the key...and (start reading at the top now lol)