Streets is in NY, I am in Pennsylvania.

Hot Tank - a large tank of casutic chemiclas that isheated to help them work better. the whole engine block, heads, etc is put in teh tank to clean off all the old grime, gunk, paint, etc.

To change a cam you will need gaskets for:
water pump, intake, timing cover, vavle covers, possibly oil pan.

you remove water pump and timing cover, valve covers and intake manifold, distribuotr and fuel pump (unless it is elec), fan shroud and alternator/AC. you then remove the lifters and push rods, timing chain. cam will slide out the front of the motor. In the truck you MAY be able to leave the rad in place, but it it easier if you remove it (the coolant is out anyway). You will need torque specs for the intake for reassembly.

To do this you will be removing the distributor, so you'll have to set the motor on TDC #1 (top dead center on #1 cylinder on teh compression stroke) BEFORE taking things apart, and make sure the motor stays there. verify this as you install the cam, dist and then again before you go to start it up. then you can check timing again.

taking hte cam out of your old 350 will be a good primer as to what you will have to do on teh 305 to put it back together.

if you can get experienced help GET IT, otherwise get a book and read it - 3 times.