63 vette Grand Sport engine build??

[iluv69s]

So, since I found out that my aluminum heads were made for the Grand Sport Vette engines (and thanks SYC for the info.), I was wondering if anyone knows details on the original engine builds?? apparently they were 'all-aluminum' 377 c.i. with a crossram weber intake set-up...I have seen pics on line, but have not come up with any details on the internals...really trick setup for 1963...
I thought maybe to build a similar motor if I could get some more detailed info...Im sure many people here know more about these motors than me...apparently only 12 motors were made total...anyone know of an original block for sale?? or for that matter, anyone know what an original block looks like??just in case I find one... any other info. would be greatly appreciated...