load the demo gct program that comes with c-com WP
its a stage motor program for 265ci and 83s,
adjust the fuel calc parameters to 278 cid injector size to 96# , tweak the crank fuel and ae fuel tables ( about -12%)
for alky lower the spark timing table to around 20* at 25psi, drop idle area to 28-30* ,drop the af table (richer like 10.5 at 25psi)
and then drive it and tune for your setup