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I'd take the 2.7 apart to see what you've got. If the 70 crank is good, I would use the 2.7crank, case and heads (see that they are 35 mm btw) then get 9.5 pistons, e cam, SSI exhaust weber.(pricey) If the 2.7 heads are 32 mm and or the crank is bad. I'd do a 2.5 SS with a counterweight crank (E or S) webers, SSI 90 mm 9.5 cr pistons(36 mm heads) or 10.5 cr twin plug if money and RPM not a question. E or S cams or even better solex cams. (very pricey) either way you will likey. best Henry
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