this is just a general engine ?. i have taken a early 90s 350 out of my surburban to relace in my boat (has approx 12000 after rebulid). The motor out of the boat is a late 90s -2002. i took the heads off the boat motor and put on my truck engine. ? is is there a difference in the head gaskets between those years. The reason asked is i have already done the swap, the gaskets i received were the late 90s -2000 somethin. i have worked on these motors many times but......... i have a water leak at the front on each head and at the rear of each head. i torqued the heads properly 3 times around 20 20 25-28. any suggestions would be appreciated has really put a damper on the day . thank u