If it's a V8 it's 1-8-4-3-6-5-7-2 and the distriburetor rotates clockwise.
The answer to this is not as easy as giving a price due to there being many models of 1966 Chevy Impala's. There are sedans, station wagons, and hardtop coupes. So in order to give a proper answer more details on the vehicle would be needed.
1965 or 1966 IMPALA
The 1966 Chevy Impala ignition switch can be removed by loosening the retaining ring at the top of the ignition switch. Remove the wiring harness. Reverse the process to install the new ignition switch.
A1966 Chevy Impala 4-door is 213.2-inches. It is 79.6-inches wide. Serial Numbers were stamped on a plate on the left front door hinge pillar.
18436572 see link
Chevrolet Impala 1962 Ford Mustang 1964 Chevy Chevelle 1966
Yes it came with the 425hp 396 in 66' for a couple of months
Look on the generator stand..it reads Zundfolge, 1- 4 -3- 2 ...thats the firing order..O.K.?
on the 63 model it is stamped on a plate attached to the left front body hinge pillar.if its not there look on the firewall
5x4.75
300
66 Impala bolt pattern is 5X4 3/4