I tow a 4000 lb. travel trailer 1-2 times a month. Back in Feb. I tore down the top end of engine due to a bent valve, at that point my bro-in-law suggested installing a rv cam which we did. I did not notice any difference at all when towing thee rv. The motor is a stock 350 goodwrench (crap) with rv cam installed. Do I need to change intake as well for this to work ? 84 K5, Crate 350, 700r tranny.