69 x 90.5 = 1775
69 x 94 = 1915
76 x 90.5 = 1956
76 x 94 = 2110
78 x 90.5 = 2007
78 x 94 = 2165
here is what i would do
1.25 rockers on solid shafts
w - 110 cam
windage pushrod tubes
40 x 35.5 valved heads cnc ported from scat or c b performance or either hand ported heads by steve tims or shadetree performance
12.5 lb. 8 dowel flywheel
chromoly pushrods
dual 40 mm IDF webers or single 44 mm IDF weber
009 distributor
petronix ignitor electronic ignition
bosch blue coil
either full flow the case or use a oil pump with the in and out cover for an external filter and cooler
and as far as crank, rods and jugs go if i was on a budget i would go with
69 x 94 = 1915
and reuse the crank and rods if possible after rebushing the rods and polishing the crank, however if i had a little more money to spend i would go with
78 x 94 = 2165
and use c b performance counterweighted crank and uni-tech rods so there would be no need for clearancing, as gasman said there is no replacement for displacement and machine work to open up the case and heads for 90.5 or 94 jugs cost the same, but what ever you decide on i HIGHLY suggest that you take the entire rotating assembly from the fan pulley to the pressure plate and have it balanced at a reputable engine machine shop, i did this to my 1915 and it was and still is the smoothest engine ( no vibration ) ive ever had by far ( out of 5 )
also dont forget if you go stroker you have to have barrel shims and longer ( cut to length instead of pre-made stock length) pushrods, also if you go the stroker route you might as well go with a 82 x 94 = 2276 unless you just dont want to clearance the case
these are just my suggestions however
