Re: 302C w/351 crank - Possible? & What comp?
14:1 comp on LPG used to be possible but they have changed the propane/butane levels over the past few years, now its about 11:1 max unless your cam is massive and you'r not planning on doing a large amount of street driving.
302/351 cleveland use the same blocks but the heads can be different, if your looking at running straight LPG with a 351 crank, rods, pistons and 302 heads then you'd be best to have some material taken out of the combustion chambers to lower compression.
Just like a Tsunami.