It is a 235 with a 216 cover.
With gas prices up to $ 4.90

a gallon over here in Germany you better watch for milage.
1959 235 Block
Bored 0.60/honed for molly rings
848 head
Howards M4F cam (I would go for langdons Bulldog cam today - live and learn)/solid lifters.
dual Offy with Holly/Webers
Self made dual exhaust (actually Mike Yoder of Kansas Kustoms did it for me)with 2 flowmaster mufflers
Mallory dual distributor
A special 6 Volt electronic Thyristor ignition.
This is not a contactless ignition like pertronics. I´m using the points to trigger a little blackbox that does the Voodoo.
Everything can stay stock, you only have to switch 2 cables.
If you hook up the box it is a difference like day and night. Great starting like a modern car, double strong spark when cold outside and independent spark power from voltage (low battery) and rpm are only a view features.
Everything else that is needed for a complete rebuild of course.
I think the good milage comes from 4 components (the rest is verry common änyways)
1. The special Ignition that a retierd Porsche ignition engineer custom build for me
Sirius Ignition Don`t be scared by the look of the website - this guy is an engineer not a designer and he does ignitions far better that websites
Also the finetunig on the Mallory advance curve.
2. A vintage (1947) water injection that allows me to advance the timing even more.
3. The raised compression milling/decking/848 head (8,75:1)
and of course the 1959 3-speed overdrive. :p
greetings from sunny southern Germany, Frank