I believe it is 10 degrees BTDC
The ignition timing for a 1970 Ford Mustang with 302 - V8 - 2 barrel carburetor is : ( 6 degrees BTDC )
10 degrees BTDC
stock setting is 10 degrees BTDC
Ford Mustang - 1983 to 1995 - fuel injection available starting in 1984
220 horsepower for the high output 302 in a 1988 Ford Mustang
You may have to take all of the pulleys off and then take the thermostat off and then take the timing cover off.
302
how to set timing on ford 1987 f-100 302 without timing light
10 degrees before top dead center(BTDC) with the SPOUT connector unplugged.
My 1991 Ford Mustang LX 5.0 L ( 302 ) was rated at 225 horsepower
I looked up a 1988 Ford Mustang 302 cubic inch ( high output ) and my Chilton book shows refer to the underhood sticker ( I know that my 1991 Ford Mustang 5.0 LX was 10 degrees BTDC )
200hp