putting a 283 Cam in your 327 wont do shit to the displacement.
but a crank on the other hand... i believe you put a 283 Large jounal crank intoa 327 and you get a chevy 302, there two different styles of 302's 1 uses the 327 block, the other a 350 block, not sure but i think they got the same bore... them maybe if you bore it out you'll get alittle bit more displacement.
Heard lots of great things about the 302's ( if u build them properly) has a big bore short stroke, so it'll buzz right up at higher RPM's, heard they are capable off reving up to 8000-9500 RPM, so they're better used in lighter race cars. it would actually work great in my chevette lol, but i already have a 408ci small block for it, right now as it sits, ( no motor or tranny, it weighs in at about 1550-1650 pounds...
small block 575 pounds dont know exactly how mucha turbo 400 weigh's. i'm thinkin maybe 150 or something.. so i'll have a 350 horse 2200-2300 pound car...