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Ok, the car is a 70 challenger with fast ratio steering, so not sure if headers will fit or not.
The car is a standard.
Rear gears are 3.55

The reason I said 400hp is just to clarify that I'm not looking for a stroker motor, just a point of reference. Mild build.
Since the motor is in great shape, I was hopeing to get better response.

Are the 906 heads a good option for this motor or would bolting on different heads make a big difference?



If the 906 heads are fresh don't worry about it, you're not looking for 500 HP so you will get by fine with 9 or 9.5:1 compression



I don't think you will get your compression in the 9s with a smog block and piston combo and 906s. Or maybe I misunderstood your post.



Sorry, to clarify, I meant that if he is going to change the pistons. If not it doesn't matter he wont have any quench anyway even with aluminum/closed chambered heads. But my main point was he's looking for a strong running 440 and doesn't need to start going crazy on spending with aluminum heads and quench if his 906 heads are already fresh. He can do well with a solid 9 or 9.5:1 engine and open chambered iron heads, unless the money is just burning a hole in his pocket.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street