I've seen weber carbs put on a I4 4AG engine (engine in Mid 80's rwd corolla's and MR2's), and for those that don't know it that's a twin cam motor as well, so apparently it can work.
However, you won't find much room for getting a larger bore in the 7M's... Think about it; this is the seventh time that block has been modified. There isn't a whole lot of room left. Anyone who has taken one of these motors apart will tell you that. Not to mention stroking it much would put the piston velocity at a dangerously high level, almost certainly leading to engine failure.
These are the main reasons that it's not feasible to get over 280ish hp out of a 7m without forced induction.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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