As I have stated before, I am new to Ford engines.
My 1984 351W HO is running fine at this time but I like to buy rebuild and peformance parts over time, so my wallet doesn't seem as light all at once. :)
I have a few questions.
1. GT40 heads on a 351...they need some bolt hole enlargement right? is that all?
2. Any Edelbrock intakes that will fit a 351w with GT40 heads? Or is the stock 4 bbl one any good?
3. I had an Edel 1406 carb on my old IROC and loved it. I will probably go with one of these again. Not a huge Holley fan. Guess this isn't a question really. Just a statement.
4. Camshaft? I hear stock is ok, but wouldn't mind upgrade. Not racing the truck, so I would like a decent idle, low rpm power. Dont feel the need to turn 6k rpms
5. I will be doing free-flowing exhaust of course and probably electric fans.
I know internet engine buildings horsepower numbers is dumb, but could this build be 250 275 hp 330 350 tq?
You're on the right track with the GT-40 heads.
Try to find a set that hasn't been excessively milled, or modified on someone's kitchen table.
I like using harden headbolt washers.
Emmisions are a fact of life these days, so when picking an intake, don't forget that it'll need to be compatable with Ford's goofy carb spacer/ EGR valve set up.
As far as "Edelbrock intakes" go, their Performer is no better than your Iron HO intake. Either will need port-matched to the larger GT heads. A Performer RPM would be ideal IF they offer an EGR compatable version for your truck.
And bear in mind that a heavy, realatively low-RPM truck needs a 180-type, dual plane intake. You can further note that that same thinking should be applied to any sort of aftermarket spacer that you may install. An "open" spacer like the one on javaguy 1978's engine is not what you want here.
I'm with you on the Edelbrock/AFB carb thing. The only time I've used a stinkin' Holley was when I had to, due to stock-class rules that I was dealing with at the time.
A 600 CFM carb is more than adequate on a 350-ish street motor.
Camshaft selection?....My suggestion there is always to contact a knowlagable cam company, give them all the revelant details they ask for and go with whatever they recomend. 90% of the time, you'll find that what they suggest will be much milder than what you'd have guessed but don't let that bother you. Them guys are perty-smart.
Exhaust?....yeah, what goes in has to come out.
2-1/4" duals, or a 2-1/4" Y into a 3" collecter works good on a the 351W's that I've been involved with.
I aint big on headers for street use because I've found them to be more trouble than they are worth.
An electric fan aint going to free-up enough engine power to even notice on a truck that weighs 4500+ pounds.
A properly built/tuned engine like you are planning will certainly reach the power fiqures you quoted.
Hope this helps.