hmmmm many people misunderstood what is torque and what is hp and what there do relating to how fast u go..and so on...nevermind ;)
anything that provides more torque to the engine will provides hp..not necessarily MAX HP. hp and max hp is not the same. look at dyno graph.
u might have a very2 high torque in 4000rpm and making high HP also at that range but u also might have a very2 poor torque at high rpm (eg.8000rpm - torque drop sooo much) then u might get a low MAX HP. hot what i mean ?
a very2 low torque and very2 high revving engine (let say 18000rpm) can't manage to change to gear 3 when uphill or too much load on that vehichle...so..is it fast ??? hehe HP is a product of torque ok
ok, back to the real question.
i personally dun have any experience in 'oldtimer' but u can try the basics for most vehicle
-big bore (got any choice of pistons ?)
-camshaft ? (errrr i dun think there is any upgrade parts for OHV..dunno la)
-big valves (also i dunno does it exist or not)
-turbo kit ? (custom made lah...but ermmm compression ratio problem also fueling)
-performance carb (consult better person..me dunno the code for weber..mikuni..solex and so on)
-thinner head gasket ?
ermm i think this is what u can do actually
-air filter...go for k&n or apexi or whatever..choose urself (for carb type)
-exhaust system...go for s-flow type. size not too big (1.8"-2.0" perhaps)
-head skimming (carefull...send to reputable worksyop)
-distributor tuning...try advance the timing. u might want the highest timing BEFORE PINGING/KNOCKING OCCUR
-skim flywheel (1-2kgs perhaps)
-lighter rims ???
-lighten body ?? (take out unnecessary things-put ur car on DIET, when car is lighter u will only put a very little step on throttle peddle in GOOO)
and the list goes on....
if i was wrong..shoot me !!! :lol: