does anybody know where I can find old L 18  head?
old copies of MS QuickBasic 4.5?
cheap old Toshiba notebooks P1 ,P2 ,with 15 volt input?
here is a link to the graph http://203.59.91.14/

here sum info on the  head that I ported for 2 years
then fitted to a bluebird L20 block
the main problem heavy knocking once over 3000 rpm
about 25 deg to much advance due to mechanical advance
but this advance never hurt the pistons
I later lowered the compression to 8 to 1 and
the max advance was in the order of 22 deg above 3000 rpm
the graph attached was with the high compression head
I started to program a notebook to run the spark timing
this program has taken 5 years to complete
its written in QuickBasic 4.5
im rebuilding it again this time with a higher compression ratio than before
to see if I can get it to fire more on the down side
remember the graph is with noload so take vac advance off and its
a few deg on the down side