I just had to reg and login to see this Offy that is
" it's only good for high revs,rpm's!! ". NOT!
That Offy is a piece of junk. In the Big FE Intake Comparo it was at the bottom of the pack, always.
As kdtrucker said the C7ZX-9425A is a great intake.
There are many great intakes both single 4 and dual 4 for the FE.
The Offy is not one of them.
It does not matter what heads you have that intake will always be at the bottom of the pack.
Read Jay Browns book at fepower.net
The C7 and C8 heads are considered smog heads and have a lower exhaust port by about a 1/4" than earlier heads. The C1's do have a taller intake port, but taller is not always better.
Look at the port on a Med Riser or an Edelbrock FE head and they are smaller
but flow more.
The best head for the money today is the Edelbrock.
With a good valve job and a clean up of the ports they will pull past most iron FE heads ever made. Even Cobra Jets. And they cost about the same as you spend on a full tune up on a set of C8's.
Cost is always a factor and it's easy to say you need this or that.
Run what you can afford, but don't expect much from that Offy. jmo
Here are a couple of high rpm FE intakes. mine