Ok. Do you realize what this is actually telling you? Here, let me break it down for you...
FORD did some research on the 385 big block series for performance enhancements. From there, they decided to take those enhancements and apply them to a different engine block. In this case, the 351. Just because they applied the 385 technology to the 351 block, does not make the 351 a big block!
Throughout the years, there's been differing values used for determining if an engine was a "big block" or "small block". Some argue physical size. Others argue displacement. Others argue production HP numbers (ie, non-modded engines). Still others argue the crank journal sizes OR stroke OR....well you get the point.
One make does not fit that mold. That would be Pontiac. The external dimensions of their blocks - from the lowly 301 all the way up to the 455 - share the exact same external dimensions. That's why its so popular to take a 301 powered car and drop a built 400/455 into it. Even all the accessories move over from one block to the next.
From one classic car owner to another - nice car but you don't know much about it. Please take a few minutes and do some reading on your car so that when you actually take it out to a cruise, you can speak intelligently about it.
Here's mine:
1978 Y88 Pontiac ***** Am - PHS documented
**Y88 denotes Gold special edition car. Included gold accents on T-tops which I have in storage, gold emblems instead of red, gold turned dash bezel, gold steering wheel spokes, etc.
L78 Pontiac 400 V8 engine. This is the lower of the two Pontiac engines, the higher performance being the W72 package.
AC/auto/PW/PL/PT (power trunk)
Big 3 done in 4 gauge for now
Knu Konceptz battery adapters - top post. I converted from the stock side posts.
140A 1 wire alt - stock was 60A 3 wire
Currently the numbers matching engine is sitting in my basement and a 1970 4 bolt main 455 punched 60 over is sitting between the wheel wells.
Audio wise - Pioneer single DIN mounted in the map pocket with Pioneer 4 channel amp driving (2) Pioneer 6x9 4ways in the rear package tray. Cost me a little over $300 which was in my budget for audio. Future plans include adding (2) 4" speakers to the center console to bring the stage forward and a sub - probably 8-10" in size in the trunk.