Here is the deal: Im looking at a new engine. I now have 3.73 gears and a new700r tranny. I have 33" tires in my basement waiting for my lift. I tow a boat every year on the highway to cabo san lucas mexico at 70mph. In third gear with 31" tires, the engine is quite busy at this speed and I'm reluctant to go lower in gearing. After I mount the 33's I can either spend the $1000 for 4.11's plus $2000 for a replacement 350 with a rv cam or I'm thinking I could get the 383HT when it finally come in for $3000 and stay with the 3.73's allowing me to run lower rpms for long distance. Any thoughts or guidence would be great. Thanks.