If you dont want the A14 you could do the opposite and install an a12a crank 70mm
stroke with e15 140.08mm/5.537 inch rods and 77mm Honda EL 27.5 comp height pistons.
This will need the crankpins machined which will cost about 100USD in your currency
and then youll have the 40mm crankpins 7mm or so longer rods and lightweight pistons.
Youll end up with 1304cc and the benefit of a higher rod stroke ratio for efficiency
by getting all the energy you can from each powerstroke.
Alternatively you could have the a14 crankpins offset ground for 72mm stroke
that will give 1341cc but will use higher octane fuel. However you might want to
just get a cheap a12a crank and the other bits first to save having the car out of action.




70mm stroke will give 2.001 rod stroke ratio
1.520 mm not including head gasket
72mm will give 1.946
0.520 mm not including head gasket

This will mean youll have the a10 like rod stroke ratio
but with more capacity to help up hills and smooth take off.

Ignition is also very overlooked for lean mixtures.

With the electrical theory
itd be better to charge the alternator when breaking but will
need a big AC alternator with yellow top style battery so it
takes the charge quickly when breaking. Also I doubt you do
much breaking in your trials if you can avoid it :) ?