[WheelsUp]

I vote 351W,I did not read all the post except the first one and I will say this,a 347 is right at the ragged edge as far as a 302 block goes,yeah 347's can make tremendous power no doubt,but what is the trade-off reliability that is the trade off.

I know we are comparing a 347 to a 351 but remember this it takes a 302 to rev to 6500rpm to make the same power as a 351W revving to 5800rpm,rpm's cost reliability,much as I like hearing a small block rev to the moon it hurts in the long run.

Get a 351 lot of companies out there right now sell oil pans,exhaust,pulleys,everything needed for a conversion so it is not hard.

Just remember this combo is what makes power,if you get either one 347 or 351 make sure you get a well balanced combo,stay away from the bigger flow numbers is better,and you will be alright either way you go. Just my 2 pennies.