A 13B will certainly go in there (you will need an older 13B front cover, usually available on eBay and sometimes on here). I would recommend a 13BT (out of a turbo car) without the turbo. These engines are good for way more than factory turbocharged output (185 Hp) - naturally aspirated. You don't need big power for rallying, 250 Hp (easily doable out of a NA 4-port) is plenty (unless you do hill climbs).
I personally think that turbo chargers add a lot of potential failure points for use in a rally application.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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