Recently had an Edelbrock/Musi 555 EFI engine installed in my 72 SS.
Headers are Stahl #202's with full 3" x pipe exhaust from header collectors to tailpipes through Flowmaster 3 chamber mufflers.
Stewart Stage 2 waterpump,March serpentine pulleys.Large electric fan with shroud.
Turbo 400 transmission with 3000 stall conveter.
H R Parts & Stuff sway bar and upper/lower control arms.
Mosur complete 12 bolt rear end with 3.73 ratio
Strange chrome moly driveshaft with 1350 u joints
A "Dynopak" hub dyno was used for the power testing/tuning check.
Did a premlinary warmup pull 2500 to 3500 rpm's to confirm converter stall and get driveline etc to relative running temperature.
Then did a full(8 second) pull.Results were amazing and very satisfying to say the least.
Over 600 ft lbs of torque from 3000 to 4800 rpms and RW horsepower of 556 at 5200 RPM's.There was more still there.
Power curve was still rising so going up another few hundred RPM's( eg:6000) may have brought HP total to close to the 580 - 600 level? Crazy.
The AFR ratio stayed perfect throughout.
Based on this I decided no further tuning tweaks were required.
I have to say the Edelbrock RPM XT tuning module is relatively easy to learn and when used as per Edelbrock's instructions gets the job done as evidenced here.
The car's driveability is superb and with the power to put a big grin on your face when you get into it.
Real sleeper for sure.Love it.

sounds great! I've had my eye on one myself. Let us know if any issues pop up.

Drag Strip Test Results

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Ran the car last Friday(Aug.12th). I was very pleased.

First time out ran 11.17 sec at 123.25 mph! 60 ft was average at 1.62 sec.

Motor was still pulling strong at the end .Went through traps at approx.6000 RPM's

AND Beat our friend's brand new Nissan GTR by a nose. He ran 11.24 sec at 122.4mph.YES!!!

The old Chevelle is definately capable of mid 10 sec. runs per a little playing with tire pressure and maybe loosening up the front end a bit (eg:disconnect front sway bar.)

Drove to and from the track, a return trip of about 150 miles. No issues.

Nice results! Those Musi 555's are nice bud.

Sounds like you have got a nice combo there!!!!!
do you have any pictures of thie install/engine, would love to see more on this!!!!!

those blocks have a hefty pprice tag on them too!!!!