Motronic 1.0 component identification
Corrected part number is 6N60  with bin 8 tolerance

6N60 MOSFET. 

Type Designator: 6N60
Type of Transistor: MOSFET
Type of Control Channel: N -Channel
Maximum Power Dissipation (Pd): 125 W
Maximum Drain-Source Voltage |Vds|: 600 V
Maximum Gate-Source Voltage |Vgs|: 30 V
Maximum Drain Current |Id|: 6.2 A
Maximum Junction Temperature (Tj): 150 °C
Rise Time (tr): 70 nS
Drain-Source Capacitance (Cd): 95 pF
Maximum Drain-Source On-State Resistance (Rds): 1 Ohm
Package: TO-220_TO-251_TO-252_TO-220F_TO-220F1_TO-263    

Datasheets of found equiv , not verified
https://alltransistors.com/mosfet/transistor.php?transistor=19485

The key parameters for a fuel injector power FET are low RdsOn, good heatsink, low pF. 
This old class of Nch FETs had a threshold of 2~4V meaning a Vs(th)=3V+/-1V    


Fuji Power FMI 16N60E offers better tolerances 3V +/-0.5V and lower RdsOn at Vgs=10V than original part


techie details

The (8) suffix printed on would indicate some sorted value for maximum Ron=Rds=RdsOn at some Vgs like 10V which is usually 3x Vgs(th) but just best guess. Considering these were newly developed technology from companies like International Rectifier the tolerances and defect rates were higher than mature modern parts. 

The existing part is called a TO-5 is obsolete for these part types and a better case is the  TO-220. The former heatsink in an open air might be 40'C/W in open convection, but higher inside an enclosed case.  At a minimum, the equivalent heatsink size is shown below for a TO-220 in low profile.  Kapton Tape or equiv insulation tape may be needed to prevent shorting exposed conductors. The PCB holes would need to be enlarged for TO-220 pins and paths resoldered.  



Overall debug  http://www.hiperformancestore.com/motronic.htm