I have a 1997 GMC K2500 Suburban with an L29 454 4WD. I am currently doing an engine build. I will be running a Competitions Cams camshaft with 0.54" intake and exhaust lift (with 1.8:1 rockers), 206 degrees intake duration at 0.050" lift, 212 degrees exhaust duration at 0.050" lift. I hope to be running Doug Thorley Tri Y Headers. I can get the Tri Y Headers from Summit for a 1995 K2500 Suburban with an L19 454 and 4WD. i was wondering if they would fit my truck with L29 heads (Summit part # DTE-388Y-C). I bought some Keith Black (Kb-202-030) hypereutectic pistons. Running a stock L29 head with 100cc chambers will put me at about 9.5:1 static compression ratio. I was wondering if you guys could suggest some intake and cylinder head upgrades. I want to run port fuel injection. I am building this engine to have low end torque. I want it to pull heavy trailers effortlessly. Any suggestions.