Thank you every one for all your input and photos !! I really appreciate all the input !!

Every thing said about milling the pistons is taken on board. I will keep you guys posted on how it goes.

techinspector1, can I bounce another cam option off you (and anyone else too) please.

We agreed that the Edelbrock "performer RPM" intake was suitable for my application.

I have been researching and found that Eddelbrock offers a "Top end kit" their part number 2095, which includes 2 aluminum heads, the performer RPM intake and their 7162 camshaft.

They say this complete kit has been tested on a 9.6:1 compression 454 and produces 540HP and 539 ft/lbs which are great figures for my application.

I was wondering about using their camshaft in place of the comp cams 11-600-8.
Edelbrock states that this camshaft is matched to perform with their RPM intake, which I will be using anyway.

I would use those with my existing 781 heads and later on, once the car is running if I feel I want more performance out of it, I could install their RPM heads which would then make up their top end kit.

I have looked at their power and torque graph for the top end kit on the 9.6:1 454 and compared it with the graph obtained from Comp Cams online cam quest software. I plugged in all the numbers and looked at the graph for their 11-600-8 cam

The Edelbrock cam seems to be more suitable for me because it provides more power and torque even at the lower revs.

I have watched a video of a Chevelle online, which is running the top end kit on a 60 over 454 and it sounds great too.

Your valuable input please