2 things

[twhrider2]

Might try Car Shop Inc. I just ordered the Pertronix 2 ignitor and coil from them today as they seemed to have pretty good prices on these. My 470 already had the ignitor but a regular coil. Wanted to upgrade to the "2" and use larger plug wires and plug gaps.

[wellcraftv20step]

twhrider2 is the 2 high performance

[wellcraftv20step]

Spare, I know i have to change the transom plate but i was just wondering if the bolt holes in the transome are the same for both the 3.0 and the 3.7 .

[spareparts]

what year models are you dealing with,

[wellcraftv20step]

The 3.0 is a 96, the 3.7 is an 87

[twhrider2]

seems to be some slight performance advantages as far spark timing and a little hotter coil.needed? not sure, maybe just the latest and greatest for a couple more bucks.

[spareparts]

you shouldn't have to change anything other than the exhaust pipe to the transom plate. Either transom plate has the same dimensions, check the spread of the motor mounts with a tape measure, they should be the same. They standardized most of the transom assembly back in 84. As far as timing goes, run no more than 5 degrees initial, I can't remember what the total was, but they had a service bulletin saying to set all the 3.7 to 5 initial. While you have the point plate off, check the advance weights and springs.