Fuel flow! either blockage in fuel pipe or float level in carb set incorrectly.
No the 390 is a big block the 302 is a small block.
Spark plugs
The spark plug gap is ( .044 inch )
Two. The standard Ford 302 and the 302 HO VIN M.
1986 f150 emisson light on is their restn set
1-5-4-2-6-3-7-8
Autozone
200hp
pretty much any 302, or 351 heads will fit
.035 inch ( for the 302 / 360 / 390 cubic inch V8 engines )
According to one of Fords websites : For a 1986 Ford Mustang , 5.0 L / 302 cubic inch V8 engine : The spark plugs are gapped at ( .050 inch )
if you have to ask you won't be able to do it by your self a 302 or 351 will fit but you will need a 302 powered thunder bird for parts