The main things you have to change are the cam shaft and timing gears. It is also EXTREMELY important to use a reverse rotation rear main seal and to change the thrust face of the pistons (Turn them around 180 degrees on the con. rods. The starter must be changed as well, and sometimes water pumps are unidirectional. It is a fairly involved procedure. One more thing: If you are doing this for a marine operation, you shoulfd also use MARINE use head gaskets as they are made to not corrode. there is a company on E bay that sells complete kits for rebuilding motors and changing their direction.
car/truck and marine Clockwise and counterclockwise rotations require different cam shafts.
reverse rotation firing order 1 2 7 5 6 3 4 8 small block chevy
clockwise
1,8,4,3,6,5,7,2 and the rotation is clockwise
All serpentine belt driven water pumps on SBC engines are reverse rotation.
To loosen:counter-clockwise.
You will need a reverse rotation cam and lifters, reverse rotation front a rear main seals, reverse rotation distributor, and a reverse rotation starter.
Check all vacuum lines.
Standing in front, looking at the engine, clockwise.
no thay are not.
Remove the trans and take it to a transmission repair shop.
A Chevy 305 is not a transmission it is a motor. If you mean a Chevy turbo 350 then the answer would be 3 different forward speeds and reverse.