Yes there are freeze plug(S) on a Ford 390. There is more then one on each side though I don't recall how many, I believe there are 6.
A 1968 Ford Galaxie 500 with a 390 engine should use a spark plug such as an E3 brand spark plug. This plug should have a tapered seat with 18mm threads.
It depends on the year and engine. Pre 1977 with the medium block 360 and 390 there are freeze plugs on each side of the back of the engine, difficult to access between engine and firewall. 1997 and newer, with 351W same plus one freeze plug on the front of the block. In 1996 the 351 was dropped in favor of the 4.6 Triton that has three on each side of the block, none in rear or front
Points .017 and spark plug .035
Ford uses Motorcraft Spark plugs on all there vehicles.
According to one of Fords websites : For a 1967 Ford Galaxie , 6.4 liter / 390 cubic inch V8 engine : ( the spark plugs are gapped at .035 inch )
.035 inch spark plug gap for a 390 V8 in a 1973 Ford truck ( according to www . motorcraft . com - no spaces )
fordparts.com shows the 1967 Ford Mustang 390 cubic inch ( 6.4 liter ) spark plug gap as ( .035 inch )
.044 inch
Passenger side, front of engine.
std bore is 4.050
about 6 quarts
.017