Stop in for a cup of coffee

toolmanmike said
I think that will get you a 349 with a 360 stroke. A 4" stroke get's you a 390

they usually max bore it to .090 when they do that as well. If my math is right, a 4 inch stroke on the stock 3.91 bore would be around 380, max bore to a 4.00 gets 4.02