Intake&exhaust tuning

[Clare Snyder]

Not strictly EFI, but since I wish to inject this little fellow and need to
fet the tuning soeted out first, it is EFI related.

On a 4 cyl opposed engine with siamesed intake and exhaust (Soob EA81) what
is involved in calculating the best intake runner lengths and exhaust tube
size, length, and crossover.

The exhaust opens 60 bbdc and closes 20 abdc Intake opens 20btdc and closes
60 atdc. Need max HP at about 4800 RPM. Now for the fly in the ointment. The
firing order is such that the 2 siamesed cyls fire sequentially, and banks
alternately, so each exhaust sees pop - pop - hush - hush, and each intake
sees suck - suck - rest - rest. What is the best approach to tuning this
system?