The GM 4.3 is a pretty durable engine a kicks out a suprising amout of power. The 4.3 seems to have more power than the small v8,s suuch as the 262, 283, 307 and low performance 327s of the late sixties early seveties. I know, back in those days anything less than a 350 was scoffed at as not having enough power. Enjoyed seeing this conversion. Hope it lives long for ya.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T