The advantage of running a BBC over a SBC is that there is a wider variety of factory head casting heads than will make a number of different combinations and all of the factory components are alot beefier than SBC parts
Start out by getting the casting numbers them go to
www.mortec.com to find out the details. Depending on the casting numbers you really do not need to get exotic parts.
2 bolt block Will work great for any thing any street power and light nitrous.
You will most likely have dished pistons if they are in good shape you can get a set of closed chamber 396 heads 106 cc or 98cc and raise the compression and you can still find them fairly easy and cheap.
781 heads came of trucks from 73-early 80's and 049 came in cars from 72-late 70's they are a great big chamber head 119 - 124 cc but to get 10-1 compression you need to run a dome piston.
if your current engine has high milage but it still runs fine rebuild the heads, change cam and timing chain then slap on a good intake and you'll be more than happy with the power.
My current combo that is in my dually is a rebuilt set of 781 heads with 2.08 intake valves and 1.88 exhaust valves. .250 dome pistons, zero decked block, cast rods, cast crank, fully balanced rotating assembly, Hyd camshaft, roller tip rockers, and aluminum intake.
The engine that I am building for my stepside is a 489 stroker, Which is a 4 bolt block, steel 4.250 crank, steel 6.385 rods, forged flat top pistons, comp cams solid roller cams, and cast Merlin rectangular heads wi 2.30 intake and 1.88 exhaust. This will be topped off with a procharger.
here is a couple of links to some of my projects
http://rides.webshots.com/album/561312109qZxSuQ?vhost=rideshttp://rides.webshots.com/album/561303375LQqZyX?vhost=rideshttp://rides.webshots.com/album/561297947ZezRGa?vhost=rides
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