Hi there, I recently bought a 1986 bayliner 21 foot cuddy cabbin which had a volvo penta 225d engine which was blown....so i replaced it with a chevy 350 every thing seems to run good except i cant get over 4000 rpms....without it backfireing or should i say misfireing....there is oil where the plug wire plugs into the cap and oil in the top of the coil....and this coil is running of a resistor only has about 7.2v is my coil junk??? can i replace the coil with a normal auto 12v coil or will that smoke my points......really would like some advice and help ........please help ...not much time left in my boating season this year... and the guy i got it from said he could run 40 to 45 mph with the 225d im getting 32 with the 350 auto engine....i would think if i could get up in the higher rpms such as 45 to 4800 rpms i could get 40 mph....please help ......thanks in advance