swappin a 292 for a 350

[ya it is a classic]

hey guys i found a 1972 gmc 1/2 ton 2wd pickup at the neighbors and it has a overhauled 350 with 13000 miles. my friend is going to buy it for 200 (its rough) but before i said anything about my friend looking for a pickup the neighbor said i could swap the 350 for my 292 with 80k on it for free. so my 67 gmc is a 1/2 ton 2wd with a 4speed manual and the 72 has a 4speed manual too. im going to swap the motor 2maro what will that entail? this is my first motor swap. the 72 has power brakes so will the brake booster thing work with the 292. also the 292 is a 1970. it was swapped before i got the pickup. can i just swap the motor mounts around or will need the welder? and does the 72 have an electric fuel pump? will the transmission bolt up? on the 67 reverse is left than down and the 72 its right than down(i think). and do i have to pull the transmission or will it be easier to leave it in the truck?